JOHN D. CLARK L.P.C.
NPI 1235223041
Counselor - Professional in Martinsburg, WV

NPI Status: Active since October 03, 2006

Contact Information

235 S WATER ST
MARTINSBURG, WV
ZIP 25401
Phone: (304) 263-8954

NPI Profile Information
Primary Taxonomy
Insurance Plans Accepted
Medicare Participation & PECOS Status
NPI Validation
Other Providers Same Location
Frequently Asked Questions

Individual
Male
Counselor
Professional
Accepts Insurance
PECOS Enrolled

About JOHN CLARK

This page provides the complete NPI Profile along with additional information for John Clark, a provider established in Martinsburg, West Virginia with a medical specialization in Counselor, focusing in professional . The healthcare provider is registered in the NPI registry with number 1235223041 assigned on October 2006. The practitioner's primary taxonomy code is 101YP2500X with license number 6401007651 (MI). The provider is registered as an individual and his NPI record was last updated February 2026.

NPI: 1235223041
Provider Name: JOHN D. CLARK L.P.C.
Gender: Male
Entity Type: Individual
Location Address: 235 S WATER ST MARTINSBURG, WV 25401
Location Phone: (304) 263-8954
Mailing Address: 235 S WATER ST MARTINSBURG, WV 25401
Mailing Phone: (304) 263-8954
Is Sole Proprietor?: No
Enumeration Date: 10-03-2006
Last Update Date: 02-04-2026
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Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification: Counselor Professional
Taxonomy Code: 101YP2500X
Type: Behavioral Health & Social Service Providers
License No.: 6401007651
License State: MI

Insurance Plans Accepted

According to publicly available information the provider might be accepting the following health plans from these health insurance companies:

CareSource

Bronze 7500 $25 Generic Drugs - HMO
Bronze 7500 $25 Generic Drugs + Adult Vision & Fitness - HMO
Diabetes Gold 3000 $0 Chronic Care Drugs & Services - HMO
Diabetes Gold 3000 $0 Chronic Care Drugs & Services + Adult Vision & Fitness - HMO
Diabetes Silver 5000 $0 Chronic Care Drugs & Services - HMO
Diabetes Silver 5000 $0 Chronic Care Drugs & Services + Adult Vision & Fitness - HMO
Gold 2000 $15 Generic Drugs - HMO
Gold 2000 $15 Generic Drugs + Adult Vision & Fitness - HMO
Healthy Heart Gold 3000 $0 Chronic Care Drugs & Services - HMO
Healthy Heart Gold 3000 $0 Chronic Care Drugs & Services + Adult Vision & Fitness - HMO
Healthy Heart Silver 5000 $0 Chronic Care Drugs & Services - HMO
Healthy Heart Silver 5000 $0 Chronic Care Drugs & Services + Adult Vision & Fitness - HMO
Low Deductible Silver 5000 $3 Generic Drugs - HMO
Low Deductible Silver 5000 $3 Generic Drugs + Adult Vision & Fitness - HMO
Low Premium Bronze 10600 $25 Generic Drugs - HMO
Low Premium Bronze 10600 $25 Generic Drugs + Adult Vision & Fitness - HMO
Low Premium Silver 6200 $3 Generic Drugs - HMO
Low Premium Silver 6200 $3 Generic Drugs + Adult Vision & Fitness - HMO
Platinum Zero $5 Generic Drugs - HMO
Platinum Zero $5 Generic Drugs + Adult Vision & Fitness - HMO

Highmark Blue Cross Blue Shield West Virginia

my Blue Access WV Major Events PPO Catastrophic 10600 - 3 Free PCP Visits - PPO
my Blue Access WV PPO Bronze 3800 - PPO
my Blue Access WV PPO Bronze 3800 + Adult Dental and Vision - PPO
my Blue Access WV PPO Bronze 9200 - PPO
my Blue Access WV PPO Gold 0 - PPO
my Blue Access WV PPO Gold 0 + Adult Dental and Vision - PPO
my Blue Access WV PPO Gold 1700 HSA - PPO
my Blue Access WV PPO Premier Gold 0 - PPO
my Blue Access WV PPO Premier Gold 0 + Adult Dental and Vision - PPO
my Blue Access WV PPO Premier Silver 0 - PPO
my Blue Access WV PPO Premier Silver 0 + Adult Dental and Vision - PPO
my Blue Access WV PPO Standard Bronze 7500 - PPO
my Blue Access WV PPO Standard Gold 2000 - PPO
my Blue Access WV PPO Standard Gold 2000 + Adult Dental and Vision - PPO
my Blue Access WV PPO Standard Silver 6000 - PPO

Medicare

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

Medicaid

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

*Please verify directly with this provider to make sure your insurance plan is currently accepted.

Additional Identifiers

The NPI Enumerator encourages providers to submit additional identifiers with their NPI application although the submission of this information is optional. The additional identifier(s) section includes other numbers or codes currently or formerly used as an identifier for the provider by other public healthcare entities. The identifiers may include UPIN, NSC, OSCAR, DEA, Medicaid State or PIN identification numbers.

Identifier	Type / Code	Identifier State	Identifier Issuer
0023817001	MEDICAID (05)	WV

Medicare Participation & PECOS Enrollment Status

John Clark is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging and Durable Medical Equipment (DME).

What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.

Is the provider registered in PECOS? Yes
Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes
Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes
Eligible to Order or Refer a Home Health Agency (HHA): No
Eligible to Order or Refer Power Mobility Devices: No

NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1235223041, we treat the final digit (1) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 59. The final step is to find the difference between that total and the next multiple of ten (60 - 59 = 1).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 6

Pos 4

Unchanged

Pos 5

Doubled → 4

Pos 6

Unchanged

Pos 7

Doubled → 6

Pos 8

Unchanged

Pos 9

Doubled → 8

Check

Target digit

Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 3 → 6 2 → 4 3 → 6 4 → 8

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 2 + 6 + 5 + 4 + 2 + 6 + 0 + 8 + 24 = 59

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 59 is 60. The difference is the calculated check digit.

60 - 59 = 1

This NPI is valid

The calculated check digit is 1, which matches the last digit of 1235223041.